ES6 unicode escapes, part 2: Regexps.

src/regexp.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Object = global.Object;
 // var $Array = global.Array;
 
 var $RegExp = global.RegExp;
 
 // -------------------------------------------------------------------
 
 // A recursive descent parser for Patterns according to the grammar of
 // ECMA-262 15.10.1, with deviations noted below.
 function DoConstructRegExp(object, pattern, flags) {
   // RegExp : Called as constructor; see ECMA-262, section 15.10.4.
   if (IS_REGEXP(pattern)) {
     if (!IS_UNDEFINED(flags)) {
       throw MakeTypeError('regexp_flags', []);
     }
     flags = (pattern.global ? 'g' : '')
         + (pattern.ignoreCase ? 'i' : '')
         + (pattern.multiline ? 'm' : '');
+    if (harmony_unicode)
+        flags += (pattern.unicode ? 'u' : '');
     if (harmony_regexps)
         flags += (pattern.sticky ? 'y' : '');
     pattern = pattern.source;
   }
 
   pattern = IS_UNDEFINED(pattern) ? '' : ToString(pattern);
   flags = IS_UNDEFINED(flags) ? '' : ToString(flags);
 
   %RegExpInitializeAndCompile(object, pattern, flags);
 }
@@ skipping 194 matching lines @@
 function RegExpToString() {
   if (!IS_REGEXP(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['RegExp.prototype.toString', this]);
   }
   var result = '/' + this.source + '/';
   if (this.global) result += 'g';
   if (this.ignoreCase) result += 'i';
   if (this.multiline) result += 'm';
   if (harmony_regexps && this.sticky) result += 'y';
+  if (harmony_unicode && this.unicode) result += 'u';

[mathias, 2015/01/08 17:12:56]

Let’s move this up one line so `u` goes before `y` here as well, for
consistency.

[marja, 2015/01/09 12:11:57]

Done.

   return result;
 }
 
 
 // Getters for the static properties lastMatch, lastParen, leftContext, and
 // rightContext of the RegExp constructor.  The properties are computed based
 // on the captures array of the last successful match and the subject string
 // of the last successful match.
 function RegExpGetLastMatch() {
   if (lastMatchInfoOverride !== null) {
@@ skipping 178 matching lines @@
 
   for (var i = 1; i < 10; ++i) {
     %DefineAccessorPropertyUnchecked($RegExp, '$' + i,
                                      RegExpMakeCaptureGetter(i), NoOpSetter,
                                      DONT_DELETE);
   }
   %ToFastProperties($RegExp);
 }
 
 SetUpRegExp();